JP2020523826A - Method for transmitting and receiving acknowledgment information between a terminal and a base station in a wireless communication system and apparatus supporting the same - Google Patents

Abstract

A method and apparatus for a terminal to transmit acknowledgment information to a base station in a wireless communication system, wherein N pieces (N is a natural number) of downlink data are received, and one piece of downlink data is M pieces (M is a natural number). Transmission block (Transmission Block; TB), and one TB includes L (L is a natural number) code block groups (Code Block Group; CBG); total N* included in N downlink data. The acknowledgment information for M*L CBGs is bundled to the acknowledgment information of X (X is a natural number smaller than or equal to 1 and smaller than N*M*L) bit size based on a certain rule. Perform; and transmit the bundling X-bit size acknowledgment information to the base station.

Description

The following description relates to a wireless communication system, and relates to a method for transmitting and receiving acknowledgment information between a terminal and a base station in the wireless communication system and an apparatus supporting the method.

Wireless access systems are widely deployed to provide various communication services such as voice and data. Generally, a wireless connection system is a multiple access system that can share available system resources (bandwidth, transmission power, etc.) to support communication with a plurality of users. Examples of the multiple access system are a CDMA (code division multiple access) system, an FDMA (frequency division multiple access) system, a TDMA (time division multiple access multiple access) system, and an OFDMA (orthogonal division multiple access) system. There is a carrier frequency division multiple access system.

Since many communication devices require a larger communication capacity, there is an increasing need for improved mobile broadband communication as compared with the existing RAT (radio access technology). In addition, mass-scale MTC (Machine Type Communications) that connects various devices and things to provide various services anytime and anywhere has been considered in next-generation communication. Further, a communication system design considering a service/UE sensitive to reliability and delay is also considered.

The introduction of next-generation RAT in consideration of such improved mobile broadband communication, large-scale MTC, and Ultra-Reliable and Low Latency Communication (URLLC) has been discussed.

An object of the present invention is to provide a method for transmitting and receiving acknowledgment information between a terminal and a base station in a wireless communication system, and an apparatus supporting the method.

The technical object to be achieved by the present invention is not limited to the matters mentioned above, and other technical problems not mentioned above are described in the embodiments of the present invention described below. It may be considered for those of ordinary skill in the art.

The present invention provides a method for transmitting and receiving acknowledgment information between a terminal and a base station in a wireless communication system, and an apparatus supporting the method.

As an aspect of the present invention, a method of a terminal transmitting acknowledgment information to a base station in a wireless communication system, wherein N (N is a natural number) downlink data is received, and one downlink data is M pieces. (M is a natural number) transmission block (Transmission Block; TB) is included, and one TB includes L (L is a natural number) code block group (Code Block Group; CBG); and is included in N downlink data. Acknowledgment information for a total of N*M*L CBGs is banded into acknowledgment information of X (X is a natural number greater than or equal to 1 and less than N*M*L) bit size based on a certain rule. A method for transmitting the acknowledgment information is proposed, which includes: performing bundling; and transmitting the acknowledged information of the bundled X-bit size to the base station.

As an example, the certain rule corresponds to the first rule for bundling the acknowledgment information of all CBGs included in the same TB. At this time, the X corresponds to N*M.

As another example, the certain rule corresponds to a second rule for bundling acknowledgment information of all CBGs included in the same downlink data and having the same CBG index for each TB. At this time, the X corresponds to N*L.

As yet another example, the certain rule is included in TBs having the same TB index for each downlink data, and the acknowledgment information of all CBGs having the same CBG index for each TB is banded. Corresponds to the third rule to ring. At this time, the X corresponds to M*L.

As still another example, the certain rule corresponds to the fourth rule for bundling the acknowledgment information of all CBGs included in the same downlink data. At this time, the X corresponds to N.

As still another example, the certain rule bundles the acknowledgment information of all CBGs included in the same TB into the first acknowledgment information, and has the same TB index for each downlink data. It corresponds to the fifth rule for bundling the first acknowledgment information of all TBs to the second acknowledgment information. At this time, the X corresponds to M.

As still another example, the certain rule is a sixth rule for bundling acknowledgment information of all CBGs having the same CBG index for all TBs included in the N downlink data. Correspond. At this time, the X corresponds to L.

As yet another example, the certain rule corresponds to the seventh rule for bundling the acknowledgment information for the N*M*L CBGs. At this time, the X corresponds to 1.

As still another example, the certain rule may perform bundling step by step on the acknowledgment information for the N*M*L CBGs, and the acknowledgment response may be bundled up to Y (Y is a natural number) steps. If the size of the information is less than or equal to a specific bit size, it corresponds to the eighth rule for stopping the bundling.

As another aspect of the present invention, there is provided a method in which a base station receives acknowledgment information from a terminal in a wireless communication system, wherein N pieces (N is a natural number) of downlink data are transmitted to the terminal, and one downlink The data includes M (M is a natural number) transmission blocks (TB), and one TB includes L (L is a natural number) code block groups (Code Block Group; CBG); and from the terminal. Acknowledgment information for a total of N*M*L CBGs included in the N downlink data is bundled based on a certain rule X (X is greater than or equal to 1 and N* A method of receiving the acknowledgment information including: receiving acknowledgment information of a size smaller than M*L).

As still another aspect of the present invention, a terminal for transmitting acknowledgment information to a base station in a wireless communication system, including a receiving unit; a transmitting unit; and a processor connected to the receiving unit and the transmitting unit to operate. The processor is configured to receive N (N is a natural number) downlink data, and one downlink data includes M (M is a natural number) transmission blocks (Transmission Block; TB). Includes L (L is a natural number) code block group (Code Block Group; CBG), and the processor maintains constant acknowledgment information for N*M*L CBGs included in N downlink data. Is configured to perform bundling on the acknowledgment information of X (X is a natural number greater than or equal to 1 and less than N*M*L) bit size according to the rules of We propose a terminal that is configured to send acknowledgment information of an X bit size to a base station.

As still another aspect of the present invention, a base station that receives acknowledgment information from a terminal in a wireless communication system, including a receiving unit; a transmitting unit; and a processor connected to the receiving unit and the transmitting unit to operate. The processor is configured to transmit N (N is a natural number) downlink data to the terminal, and one downlink data includes M (M is a natural number) transmission block (Transmission Block; TB). One TB includes L (L is a natural number) code block group (CBG), and the processor confirms a total of N*M*L CBGs included in N downlink data from the terminal. A base station configured to receive acknowledgment information of size X (where X is a natural number greater than or equal to 1 and less than N*M*L), the response information being bundled according to a certain rule. suggest.

The above-described aspects of the present invention are only a part of the preferred embodiments of the present invention, and various embodiments reflecting the technical features of the present invention may be used by those having ordinary skill in the art. , Which will be derived and understood based on the detailed description of the invention detailed below.

According to the embodiment of the present invention, there are the following effects.

According to the present invention, when a terminal transmits CBG-level confirmation response information to a base station, the terminal can bundle confirmation response information as necessary and transmit it to the base station.

By this means, the terminal can transmit acknowledgment information having an appropriate bit size to the base station depending on the situation.

The effects obtained from the embodiments of the present invention are not limited to the effects mentioned above, and other effects not mentioned above are the same as those in the technical field to which the present invention pertains, from the following description of the embodiments of the present invention. Will be clearly derived and understood by those with knowledge of. That is, unintended effects associated with the implementation of the present invention can be derived from the embodiments of the present invention by a person having ordinary skill in the art.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are provided to aid understanding of the present invention and provide examples of the present invention with detailed description. However, the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to form a new embodiment. Reference numbers in the drawings mean structural elements.
It is a figure for demonstrating a physical channel and the signal transmission method using them. It is a figure which shows an example of the structure of a radio frame. FIG. 5 is a diagram illustrating a resource grid for a downlink slot. It is a figure which shows an example of the structure of an uplink sub-frame. It is a figure which shows an example of the structure of a downlink sub-frame. It is a figure which shows the structure (Self-Contained subframe structure) of a self-subframe applicable to this invention. It is a figure which shows the typical connection system of TXRU and an antenna element. It is a figure which shows the typical connection system of TXRU and an antenna element. FIG. 6 is a simplified diagram of a hybrid beam forming structure in terms of TXRU and physical antenna according to an example of the present invention. FIG. 6 is a diagram briefly showing a beam sweeping operation for a synchronization signal (Synchronization signal) and system information (System information) in a downlink (DL) transmission process according to an example of the present invention. It is a figure which shows the ACK/NACK bundling operation applicable to this invention. FIG. 6 is a diagram briefly showing an ACK/NACK bundling method according to an example of the present invention. FIG. 6 is a diagram briefly showing an ACK/NACK bundling method according to another example of the present invention. FIG. 6 is a diagram briefly showing a method of performing ACK/NACK bundling for each option of the second cell 4 ACK/NACK transmission/reception method according to the present invention and an ACK/NACK transmission/reception method based on the method. FIG. 6 is a diagram briefly showing a method of performing ACK/NACK bundling for each option of the second cell 4 ACK/NACK transmission/reception method according to the present invention and an ACK/NACK transmission/reception method based on the method. FIG. 6 is a diagram briefly showing a method of performing ACK/NACK bundling for each option of the second cell 4 ACK/NACK transmission/reception method according to the present invention and an ACK/NACK transmission/reception method based on the method. FIG. 6 is a diagram briefly showing a method of performing ACK/NACK bundling for each option of the second cell 4 ACK/NACK transmission/reception method according to the present invention and an ACK/NACK transmission/reception method based on the method. It is a figure which shows simply the method of performing ACK/NACK bundling for each option of the 5th ACK/NACK transmission/reception method by this invention, and the ACK/NACK transmission/reception method based on it. It is a figure which shows simply the method of performing ACK/NACK bundling for each option of the 5th ACK/NACK transmission/reception method by this invention, and the ACK/NACK transmission/reception method based on it. It is a figure which shows simply the method of performing ACK/NACK bundling for each option of the 5th ACK/NACK transmission/reception method by this invention, and the ACK/NACK transmission/reception method based on it. It is a figure which shows simply the method of performing ACK/NACK bundling for each option of the 6th ACK/NACK transmission/reception method by this invention, and the ACK/NACK transmission/reception method based on it. It is a figure which shows simply the method of performing ACK/NACK bundling for each option of the 6th ACK/NACK transmission/reception method by this invention, and the ACK/NACK transmission/reception method based on it. 4 is a flowchart illustrating a method of transmitting confirmation response information of a terminal according to the present invention. It is a figure which shows the structure of the terminal and base station which can implement|achieve the proposed Example.

The following embodiments combine the components and features of the present invention in a predetermined form. Each component or feature can be considered as optional, unless explicitly stated otherwise. Each component or feature may be implemented in a form that is not combined with another component or feature, or some components and/or features may be combined to form an embodiment of the present invention. The order of operations described in the embodiments of the present invention may be changed. Some constructions or features of one embodiment may be included in another embodiment, and may be replaced with corresponding constructions or features of another embodiment.

In the description of the drawings, description of procedures or steps that may obscure the subject matter of the present invention is omitted, and description of procedures or steps that are understandable to a person skilled in the art is also omitted.

Throughout the specification, when a part is "comprising" or "comprising" a component, this does not exclude other components, unless stated to the contrary. It means that the component can be further included. Further, the terms "... part", "... device", "module" and the like in the specification mean a unit that processes at least one function or operation, which means hardware, software, or hardware and software. It can be realized by combining software. Also, "a" or "an", "one", "the" and similar related terms in the context of describing the invention (especially in the context of the claims below). It can be used in the sense of including both the singular and the plural unless specifically stated otherwise or refuted otherwise by the context.

In this specification, the embodiments of the present invention are described focusing on the data transmission/reception relationship between the base station and the mobile station. Here, the base station has a meaning as a terminal node of the network that directly communicates with the mobile station. Certain operations referred to in this document by a base station may optionally be performed by an upper node of the base station.

That is, in a network including a plurality of network nodes including a base station, various operations performed for communication with a mobile station may be performed by the base station or a network node other than the base station. it can. At this time, the "base station" may be rephrased into a term such as a fixed station, a Node B, an eNode B (eNB), an advanced base station (ABS) or an access point (access point). it can.

In addition, in the embodiment of the present invention, a terminal (Terminal) is a user equipment (UE: User Equipment), a mobile station (MS: Mobile Station), a subscriber terminal (SS: Subscriber Station), a mobile subscriber terminal (MSS: It can be paraphrased into terms such as Mobile Subscriber Station), mobile terminal (Mobile Terminal), or advanced mobile terminal (AMS: Advanced Mobile Station).

Further, the transmitting end means a fixed and/or mobile node that provides a data service or a voice service, and the receiving end means a fixed and/or mobile node that receives a data service or a voice service. Therefore, in the uplink, the mobile station can be the transmission end and the base station can be the reception end. Similarly, in the downlink, the mobile station can be the receiving end and the base station can be the transmitting end.

The embodiment of the present invention is based on the wireless connection system IEEE 802. xx system, 3GPP (3rd Generation Partnership Project) system, 3GPP LTE system, and 3GPP2 system can be supported by a standard document disclosed in at least one of the systems. 211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321 and 3GPP TS 38.331 documents. That is, in the embodiments of the present invention, obvious steps or parts that have not been described can be described with reference to the above documents. In addition, any of the terms disclosed in this document can be explained by the above standard document.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description disclosed below in connection with the accompanying drawings is intended to describe exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced.

Further, the specific terms used in the embodiments of the present invention are provided for the sake of easy understanding of the present invention, and the use of such specific terms may be changed without departing from the technical idea of the present invention. The form may be changed.

Hereinafter, a 3GPP LTE/LTE-A system will be described as an example of a wireless connection system in which an embodiment of the present invention can be used.

The following technologies, CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access), etc. Can be applied to various wireless connection systems such as.

CDMA can be implemented by a radio technology such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. The TDMA may be realized by a wireless implementation such as GSM (registered trademark) (Global System for Mobile communications)/GPRS (General Packet Radio Service)/EDGE (Enhanced Data Rates for GSM (registered trademark) technology). The OFDMA can be implemented by a wireless technology such as IEEE 802.11 (WiFi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (Evolved UTRA).

UTRA is a part of UMTS (Universal Mobile Telecommunications System). 3GPP LTE (Long Term Evolution) is a part of E-UMTS (Evolved UMTS) using E-UTRA, which employs OFDMA in the downlink and SC-FDMA in the uplink. The LTE-A (Advanced) system is an improved system of the 3GPP LTE system.

To clarify the technical features of the present invention, the embodiments of the present invention are mainly described in the 3GPP LTE/LTE-A system, but may be applied to the IEEE 802.16e/m system or the like.

1.3GPP LTE/LTE A system

1.1. Physical channel and signal transmission/reception method using the same

In the wireless connection system, the terminal receives information from the base station on the downlink (DL: Downlink) and transmits information to the base station on the uplink (UL: Uplink). The information transmitted/received between the base station and the terminal includes general data information and various control information, and there are various physical channels depending on the type/use of the information transmitted/received between the base station and the terminal.

FIG. 1 is a diagram for explaining physical channels usable in an embodiment of the present invention and a signal transmission method using them.

A terminal that is turned on or newly enters a cell with the power turned off performs an initial cell search operation such as synchronization with a base station in step S11. Therefore, the terminal receives a primary synchronization channel (P-SCH: Primary Synchronization Channel) and a secondary synchronization channel (S-SCH: Secondary Synchronization Channel) from the base station, synchronizes with the base station, and receives information such as a cell ID. get.

Then, the terminal can receive the physical broadcast channel (PBCH:Physical Broadcast Channel) signal from the base station and acquire the in-cell broadcast information.

On the other hand, the terminal may check a downlink channel state by receiving a downlink reference signal (DL RS) in the initial cell search stage.

The terminal that has completed the initial cell search is a physical downlink control channel (PDCCH: Physical Downlink Control Channel) and a physical downlink shared channel (PDSCH: Physical Downlink Control Channel) corresponding to the physical downlink control channel information in step S12. Can be received to obtain more specific system information.

Thereafter, the terminal may perform a random access procedure such as steps S13 to S16 to complete the connection to the base station. To this end, the terminal transmits a preamble on a physical random access channel (PRACH) (S13) and receives a response message to the preamble on a physical downlink control channel and a corresponding physical downlink shared channel. It can be done (S14). In contention-based random access, the terminal may perform collision resolution such as transmission of a further physical random access channel signal (S15) and reception of a physical downlink control channel signal and its corresponding physical downlink shared channel signal (S16). A procedure (Contention Resolution Procedure) can be performed.

After performing the procedure as described above, the terminal then receives the physical downlink control channel signal and/or the physical downlink shared channel signal (S17) and the physical uplink as a general uplink/downlink signal transmission procedure. A link shared channel (PUSCH: Physical Uplink Shared Channel) signal and/or a physical uplink control channel (PUCCH: Physical Uplink Control Channel) signal can be transmitted (S18).

The control information transmitted from the terminal to the base station is generically referred to as uplink control information (UCI: Uplink Control Information). UCI includes HARQ-ACK/NACK (Hybrid Automatic Repeat and reQuest Acknowledgment/Negative-ACK), SR (Scheduling Requirement Rictional Indication), and CQI (Channel Priority Inquiry). ..

In the LTE system, UCI is generally transmitted periodically on PUCCH, but may be transmitted on PUSCH when control information and traffic data are to be transmitted simultaneously. It is also possible to transmit UCI aperiodically on PUSCH according to network request/instruction.

1.2. Resource structure

FIG. 2 is a diagram showing a structure of a radio frame used in the embodiment of the present invention.

FIG. 2A shows a type 1 frame structure (frame structure type 1). The type 1 frame structure is applicable to both a full duplex FDD (Frequency Division Duplex) system and a half duplex FDD system.

One radio frame has a length of Tf=307200*Ts=10 ms, a uniform length of Tslot=15360*Ts=0.5 ms, and is given an index of 0 to 19. It consists of 20 slots. One subframe is defined by two consecutive slots, and the i-th subframe is composed of slots corresponding to 2i and 2i+1. That is, the radio frame is composed of 10 subframes. The time required to transmit one subframe is called TTI (transmission time interval). Here, Ts represents the sampling time and is displayed as Ts=1/(15 kHz×2048)=3.2552×10 −8 (about 33 ns). A slot includes a plurality of OFDM symbols or SC-FDMA symbols in the time domain, and includes a plurality of resource blocks in the frequency domain.

One slot includes a plurality of OFDM (orthogonal frequency division multiplexing) symbols in the time domain. Since 3GPP LTE uses OFDMA in the downlink, the OFDM symbol is for expressing one symbol period. The OFDM symbol can be referred to as one SC-FDMA symbol or symbol period. The resource block is a resource allocation unit and includes a plurality of consecutive subcarriers in one slot.

In the full-duplex FDD system, 10 subframes can be simultaneously used for downlink transmission and uplink transmission in each 10 ms period. At this time, uplink and downlink transmissions are separated in the frequency domain. On the other hand, in the half-duplex FDD system, the terminal cannot perform transmission and reception at the same time.

The structure of the radio frame described above is only one example, and the number of subframes included in the radio frame, the number of slots included in the subframe, or the number of OFDM symbols included in the slot may be variously changed. ..

FIG. 2B shows a type 2 frame structure (frame structure type 2). The type 2 frame structure is applied to the TDD system. One radio frame has a length of Tf=307200*Ts=10 ms and is composed of two half-frames having a length of 153600*Ts=5 ms. Each half frame is composed of 5 sub-frames having a length of 30720*Ts=1 ms. The i-th subframe is composed of two slots each having a length of Tslot=15360*Ts=0.5 ms corresponding to 2i and 2i+1. Here, Ts represents a sampling time, and is displayed as Ts=1/(15 kHz×2048)=3.2552×10 ⁻⁸ (about 33 ns).

The type 2 frame includes a special subframe composed of three fields of DwPTS (Downlink Pilot Time Slot), a guard section (GP: Guard Period), and UpPTS (Uplink Pilot Time Slot). Here, the DwPTS is used for initial cell search, synchronization or channel estimation in the terminal. UpPTS is used for channel estimation in the base station and uplink transmission synchronization with the terminal. The protection section is a section for removing interference in the uplink due to multipath delay of the downlink signal between the uplink and the downlink.

Table 1 below shows the structure of a special frame (length of DwPTS/GP/UpPTS).

In the LTE Rel-13 system, the special frame configuration (DwPTS/GP/UpPTS length) is determined by X (the number of additional SC-FDMA symbols, upper layer parameter srs-UpPtsAdd) as shown in the table below. A new configuration has been added that takes into account that (provided and parameter is not set, X is 0) is set, and in the LTE Rel-14 system, a new Special subframe configuration #10 is added. Here, the UE is in the Special subframe configurations {3, 4, 7, 8} for the general CP in the downlink and the Special subframe configurations {2, 3, 5, 6} for the extended CP in the downlink. On the other hand, do not expect two additional UpPTS SC-FDMA symbols to be set. Further, the UE may include Special subframe configurations {1, 2, 3, 4, 6, 7, 8} for a general CP on the downlink and Special subframe configurations {1, 2, for an extended CP on the downlink. Do not expect 4 additional UpPTS SC-FDMA symbols to be set for 3, 5, 6}. (The UE is not expected to be configured with 2 additional UpPTS SC-FDMA symbols for special subframe configurations {3,4,7,8} for normal cyclic prefix in downlink and special subframe configurations {2,3,5,6} for extended cyclic prefix in downlink and 4 additive UpPTS SC-FDMA symbols subconformation reforms {1,2,4,6,7,8,8} , 6} for extended cyclic prefix in downlink)

FIG. 3 is a diagram illustrating a resource grid for downlink slots that can be used in an embodiment of the present invention.

Referring to FIG. 3, one downlink slot includes a plurality of OFDM symbols in the time domain. Here, one downlink slot includes seven OFDM symbols and one resource block includes twelve subcarriers in the frequency domain, but the present invention is not limited to this.

Each element on the resource grid is called a resource element, and one resource block includes 12×7 resource elements. The number NDL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth.

FIG. 4 shows a structure of an uplink subframe that can be used in the embodiment of the present invention.

Referring to FIG. 4, the uplink subframe can be divided into a control region and a data region in the frequency domain. PUCCH carrying uplink control information is assigned to the control region. PUSCH that carries user data is allocated to the data area. In order to maintain the single carrier characteristic, one terminal does not transmit PUCCH and PUSCH at the same time. The PUCCH for one terminal is assigned an RB pair in a subframe. RBs belonging to an RB pair occupy different subcarriers in each of the two slots. The RB pair assigned to the PUCCH is said to undergo frequency hopping at a slot boundary.

FIG. 5 is a diagram showing a structure of a downlink subframe that can be used in the embodiment of the present invention.

Referring to FIG. 5, OFDM symbols from the OFDM symbol index 0 to a maximum of 3 OFDM symbols in a first slot of a subframe are control regions to which control channels are assigned, and the remaining OFDM symbols are PDSCH. Is a data region to which is allocated. Examples of downlink control channels used in 3GPP LTE include PCFICH (Physical Control Format Indicator Channel), PDCCH, and PHICH (Physical Hybrid-ARQ Indicator Channel).

The PCFICH is transmitted in the first OFDM symbol of the subframe and carries information about the number of OFDM symbols (ie, the size of the control region) used for transmission of the control channel in the subframe. PHICH is a response channel for the uplink and carries an ACK (Acknowledgement)/NACK (Negative-Acknowledgement) signal for HARQ (Hybrid Automatic Repeat Request). The control information transmitted on the PDCCH is referred to as downlink control information (DCI: downlink control information). The downlink control information includes uplink resource allocation information, downlink resource allocation information, or an uplink transmission (Tx) power control command for an arbitrary terminal group.

1.3. CSI feedback

In 3GPP LTE or LTE-A systems, user equipment (UE) is defined to report channel state information (CSI) to a base station (BS or eNB). Here, the channel state information (CSI) is a generic term for information indicating the quality of the radio channel (or link) formed between the UE and the antenna port.

For example, the channel state information (CSI) includes a rank indicator (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), and the like.

Here, RI indicates the rank information of the channel, which means the number of streams that the UE receives via the same time-frequency resource. This value is determined depending on the long term fading of the channel. Then, the RI is usually fed back to the BS by the UE in a cycle longer than the PMI and CQI.

The PMI is a value that reflects channel space characteristics, and indicates a precoding index that is preferred by the UE based on a metric such as SINR.

The CQI is a value indicating the strength of the channel, and usually means a received SINR obtained when the BS uses PMI.

In a 3GPP LTE or LTE-A system, a base station configures a plurality of CSI processes in a UE and receives a CSI report for each process from the UE. Here, the CSI process is composed of CSI-RS for identifying the signal quality from the base station and CSI-interference measurement (CSI-IM) resources for interference measurement.

1.4. RRM measurement

In the LTE system, power control, scheduling, cell search, cell reselection, handover, radio link or connection monitoring (radio link or connection monitoring), and cell search (cell search), cell reselection (Cell reselection), handover (Handover), radio link or connection monitoring, It supports RRM (Radio Resource Management) operations including connection establishment/re-establishment. At this time, the serving cell may request the terminal for RRM measurement information, which is a measurement value for performing the RRM operation. As typical information, a terminal in an LTE system can measure and report information such as cell search information, RSRP (reference signal received power), and RSRQ (reference signal received quality) for each cell. Specifically, in the LTE system, the terminal receives “measConfig” as an upper layer signal for RRM measurement from the serving cell, and the terminal measures RSRP or RSRQ according to the information of this “measConfig”.

Here, RSRP, RSRQ, and RSSI defined in the LTE system are defined as follows.

First, RSRP is defined as a linear average of power distributions (in units of [W]) of cells in a measurement frequency band to be considered-resource elements that transmit a specific reference signal. (Reference signal received power (RSRP), is defined as the linear average over the power contributions (in [W]) of the resource elements that carry cell-specific reference signals within the considered measurement frequency bandwidth.) As an example, the RSRP decision Therefore, the cell-specific reference signal R0 can be utilized. (For RSRP determination the cell-specific reference signals R0 shall be used.) If the UE detects that a cell-specific reference signal R1 is available, the UE further uses R1 to determine the RSRP. (If the UE can reliably detect that at R1 is available it may use R1 in addition to R0 to detergent RSRP.)

The reference point for RSRP can be the antenna connector of the UE. (The reference point for the RSRP shall be the antenna connector of the UE.)

If the UE uses receiver diversity, the reported value should not be less than the RSRP corresponding to the individual diversity branches. (If receiver diversity is in use by the UE, the reported value not not be lower lower than thecorrespondence.

Then, RSRQ is defined as N*RSRP/(E-UTRA carrier RSSI) as a ratio of RSRP to E-UTRA carrier RSSI when N is the number of RBs of E-UTRA carrier RSSI measurement bandwidth. (Reference Signal Received Quality (RSRQ) is defined as the ratio N) RSRP/(E-UTRA carrier RSSI) where there are different values of UB's above the number of different values of RB's. And the numerator are determined by the same set of resource blocks. (The measurements in the numberer and denominator shall be made over the same set of resource blocks.)

E-UTRA carrier RSSI is a measurement band over N resource blocks for received signals from all sources including co-channel serving and non-serving cells, adjacent channel interference, thermal noise, etc. Includes a linear average of the total received power (in [W]) measured by the terminal with only the OFDM symbols that include the reference symbol for antenna port 0 in width. (E-UTRA Carrier Received Signal Strength Indicator (RSSI), comprises the linear average of the total received power (in [W]) observed only in OFDM symbols containing reference symbols for antenna port 0, in the measurement bandwidth, over N number of resource blocks by the UE from all sources, including co-channel SERVING and non-SERVING cells, adjacent channel interference, sub-layers, and sub-layers, and sub-channels, sub-layers, and sub-channels, and sub-channels, sub-channels, and sub-channels, sub-channels, and sub-channels, respectively. RSSI is measured for all OFDM symbols in the subframe. (If higher-layer signaling incertains cascade subframes for performing RSRQ measurements over the OFDM symbols in verses in verses in verses.

The reference point for the RSRQ can be the antenna connector of the UE. (The reference point for the RSRQ shall be the antenna connector of the UE.)

If the UE uses receiver diversity, the reported value should not be less than the RSRQ corresponding to the individual diversity branch. (If receive diversity is in use by the UE, the reported value not not be lower lower than the above reserving RSR of any of the individual ind.

The RSSI is then defined as the received wideband power including thermal noise within the bandwidth defined by the receiver pulse-like filter and noise generated from the receiver. (Received Signal Strength Indicator (RSSI) is defined as the received wide band power, including thermal noise and noise generated in the receiver, within the bandwidth defined by the receiver pulse shaping filter.)

The reference point for the measurement can be the antenna connector of the UE. (The reference point for the measurement shall be the antenna connector of the UE.)

If the UE uses receiver diversity, the reported value should not be less than the UTRA carrier RSSI corresponding to the individual diversity branch. (If receiver diversity is in use by the UE, the reported value not not be lower lower than the corresoning in URA carrier RSSI of any.

According to the above definition, the terminal operating in the LTE system, in the case of intra-frequency measurement, is the permissible measurement bandwidth (Allowed measurement bandwidth) transmitted from the SIB3 (system information block type 3). RSRP can be measured with a bandwidth instructed via IE (information element). Also, in the case of intra-frequency measurement, the terminal is instructed via the allowed measurement bandwidth transmitted from SIB5, 6, 15, 25, 50, 75, 100 RB (resource block). RSRP can be measured in a bandwidth corresponding to one of the. In addition, when there is no IE as described above, the terminal can measure RSRP in the frequency band of the entire DL (downlink) system as a default operation.

At this time, when the terminal receives the information on the allowed measurement bandwidth, the terminal may freely measure the RSRP value at the value as the maximum measurement bandwidth. However, when the serving cell transmits an IE defined as WB-RSRQ to the terminal and sets the allowed measurement bandwidth to 50 RB or more, the terminal needs to calculate all RSRP values for the allowed measurement bandwidth. is there. On the other hand, when measuring the RSSI, the terminal measures the RSSI using the frequency band of the receiver of the terminal according to the definition of the RSSI bandwidth.

2. New wireless access technology (New Radio Access Technology) system

As a large number of communication devices require a larger communication capacity, there is an increasing need for improved terminal broadband (Mobile Broadband) communication as compared to existing radio access technology (RAT). Further, there is also a need for massive MTC (Machine Type Communications) that connects various devices and things to provide various services anytime and anywhere. Further, a communication system design considering services/UEs sensitive to reliability and delay is presented.

A new wireless connection technology system has been proposed as a new wireless connection technology that takes into account such improved terminal broadband communication (Enhanced mobile broadband communication), large-scale MTC, and URLLC (Ultra-Reliable and Low Latency Communication). There is. Hereinafter, in the present invention, the corresponding technique is referred to as New RAT or NR (New Radio) for convenience.

2.1. Pneumatics (Numerologies)

In the NR system to which the present invention is applicable, various OFDM pneumology shown in the table below are supported. At this time, μ and cyclic prefix information for each carrier bandwidth part are signaled for each downlink (DL) or uplink (UL). As an example, the μ and the cyclic prefix information for the downlink carrier bandwidth part are signaled through higher layer signaling DL-BWP-mu and DL-MWP-cp. As another example, the μ and cyclic prefix information for the uplink carrier bandwidth part is signaled through higher layer signaling UL-BWP-mu and UL-MWP-cp. ..

2.2. Frame structure

The downlink and uplink transmissions consist of 10 ms long frames. The frame is composed of 10 subframes each having a length of 1 ms. At this time, the number of consecutive OFDM symbols for each subframe is as shown in the following Equation 1.

Each frame is composed of two half-frames of the same size. At this time, each half frame is composed of subframes 0-4 and 5-9.

Table 5 below shows the number of OFDM symbols for each slot/frame/subframe for the normal cyclic prefix, and Table 6 shows the extended cyclic prefix. Shows the number of OFDM symbols for each slot/frame/subframe.

In the NR system to which the present invention can be applied, a self-slot structure (Self-Contained subframe structure) is applied, which is the above slot structure.

FIG. 6 is a diagram showing a self-contained subframe structure applicable to the present invention.

In FIG. 6, a shaded area (eg, symbol index=0) indicates a downlink control area, and a black area (eg, symbol index=13) indicates an uplink control area. Other areas (for example, symbol index=1 to 12) are used for downlink data transmission or uplink data transmission.

With such a structure, the base station and the UE can sequentially perform DL transmission and UL transmission within one slot, and can transmit/receive DL data within one slot and also transmit/receive UL ACK/NACK for the DL data. it can. As a result, this structure can minimize the delay of final data transmission by shortening the time taken to retransmit data when a data transmission error occurs.

In such a self-slot structure, a base station and a UE require a certain time gap to switch from a transmission mode to a reception mode or from a reception mode to a transmission mode. Therefore, in the self-slot structure, some OFDM symbols at the time of converting from DL to UL can be set as a guard period (GP).

Although the case where the self-slot structure includes all the DL control region and the UL control region has been described above, the control region can be selectively included in the self-slot structure. That is, the self-slot structure according to the present invention may include not only the DL control region and the UL control region but also the DL control region or the UL control region as shown in FIG.

As an example, slots can have various slot formats. At this time, the OFDM symbols of each slot are classified into downlink (denoted as'D'), flexible (denoted as'X') and uplink (denoted as'U').

Therefore, in the downlink slot, the UE can assume that downlink transmission occurs only in the'D' and'X' symbols. Similarly, in the uplink slot, the UE can assume that the uplink transmission occurs only on the'U' and'X' symbols.

2.3. Analog beam forming (Analog Beamforming)

Since a millimeter wave (Millimeter Wave, mmW) has a short wavelength, it is possible to install a large number of antenna elements in the same area. That is, since the wavelength is 1 cm in the 30 GHz band, a total of 100 antenna elements can be provided when a 2-dimensional array is arranged at 0.5 lamda (wavelength) intervals on a 5*5 cm panel. Accordingly, in a millimeter wave (mmW), a plurality of antenna elements may be used to increase beam forming (BF) gain to increase coverage or improve throughput.

At this time, each antenna element includes a TXRU (transceiver) so that transmission power and phase can be adjusted for each antenna element. By this, each antenna element can perform independent beam forming for each frequency resource.

However, providing TXRU for all 100 antenna elements is not cost effective. Therefore, a method of mapping a large number of antenna elements in one TXRU and adjusting the beam direction with an analog phase shifter has been considered. In such an analog beam forming method, since only one beam direction can be formed in the entire band, there is a disadvantage that frequency selective beam forming is difficult.

In order to solve this, as an intermediate form between digital beam forming and analog beam forming, hybrid beam forming (hybrid BF) having a smaller number of B TXRUs than Q antenna elements can be considered. In this case, although there are differences depending on the connection method of B TXRUs and Q antenna elements, the directions of beams that can be simultaneously transmitted are limited to B or less.

FIG. 7 and FIG. 8 are diagrams showing a typical connection method of a TXRU and an antenna element. Here, the TXRU virtualization model represents the relationship between the output signal of the TXRU and the output signal of the antenna element.

FIG. 7 illustrates a method in which TXRUs are connected to a sub-array. In the case of FIG. 7, the antenna element is connected to only one TXRU.

On the other hand, FIG. 8 illustrates a method in which the TXRU is connected to all antenna elements. In the case of FIG. 8, the antenna element is connected to all TXRUs. At this time, in order to connect the antenna element to all TXRUs, another adder is required as shown in FIG.

7 and 8, W represents a phase vector multiplied by an analog phase shifter. That is, W is the main parameter that determines the direction of analog beamforming. Here, the mapping between the CSI-RS antenna port and the plurality of TXRUs is 1:1 or 1:many.

According to the configuration of FIG. 7, focusing of beam forming is difficult, but there is an advantage that all antenna configurations can be configured at low cost.

The configuration of FIG. 8 has an advantage that focusing of beam formation is easy. However, since the TXRU is connected to all the antenna elements, the total cost is increased.

When a plurality of antennas are used in the NR system to which the present invention is applicable, a hybrid beamforming method combining digital beamforming and analog beamforming is applied. At this time, analog beam forming (or RF (radio frequency) beam forming) means an operation of performing precoding (or combining) at an RF end. In hybrid beam formation, the baseband end and the RF end are pre-coated (or combined) with each other. As a result, the number of RF chains and the number of D/A (digital to analog) (or A/D (analog to digital)) converters can be reduced and the performance close to digital beam forming can be obtained.

For convenience of description, the hybrid beam forming structure can be represented by N transmitter/receiver units (TXRUs) and M physical antennas. At this time, digital beam forming for L data layers transmitted from the transmitting end is represented by an N*L(L by L) matrix. Then, the converted N digital signals are converted into analog signals via TXRU, and analog beam forming represented by an M*N(M by N) matrix is applied to the converted signals.

FIG. 9 is a schematic diagram of the structure of hybrid beamforming in terms of TXRU and physical antenna according to an example of the present invention. At this time, in FIG. 9, the number of digital beams is L and the number of analog beams is N.

Further, in the NR system to which the present invention is applicable, a method of designing a base station so that analog beam forming can be changed on a symbol basis and supporting efficient beam forming for terminals located in a predetermined area is considered. To be Further, as shown in FIG. 9, when predetermined N TXRUs and M RF antennas are defined in one antenna panel, independent hybrid beam forming is applicable in the NR system according to the present invention. A method of introducing multiple antenna panels is also conceivable.

As described above, when the base station utilizes a plurality of analog beams, the analog beams which are advantageous for signal reception are different for each terminal. Therefore, in the NR system to which the present invention is applicable, a base station applies a different analog beam for each symbol in a predetermined subframe (SF) (at least a synchronization signal, system information, paging, etc.) to obtain a signal. A beam sweeping operation is considered in which all terminals obtain a reception opportunity by transmitting.

FIG. 10 is a view briefly showing a beam sweeping operation for a synchronization signal and system information in a downlink (DL) transmission process according to an example of the present invention.

In FIG. 10, a physical resource (or physical channel) in which system information of an NR system to which the present invention is applicable is transmitted by a broadcasting method is referred to as xPBCH (physical broadcast channel). At this time, a plurality of analog beams belonging to different antenna panels can be simultaneously transmitted within one symbol.

Further, as shown in FIG. 10, in the NR system to which the present invention is applicable, a configuration for measuring a channel for each analog beam, in which a single analog beam (corresponding to a predetermined antenna panel) is applied The introduction of a beam reference signal (Beam RS, BRS), which is a reference signal (Reference signal, RS) transmitted by being transmitted is discussed. The BRS is defined for multiple antenna pots, each antenna pot of the BRS corresponding to a single analog beam. At this time, unlike the BRS, the synchronization signal or the xPBCH is transmitted by applying all analog beams in the group of analog beams so that any terminal receives well.

3. Proposed example

Hereinafter, the configuration proposed by the present invention will be described in more detail based on the above technical idea.

More specifically, in a wireless communication system, a base station configures and transmits data in a slot (DL), which is a (basic) scheduling unit, in a plurality of code block groups (Code Block Group, CBG) and supports it. Then, when the terminal determines ACK/NACK, which is the success/non-presence of data decoding in CBG units, in the present invention, a plurality of PDSCHs (or transport block (TB) or CBGs) corresponding to a plurality of (received) PDSCHs are received by the terminal. A method (hereinafter, ACK/NACK bundling) of combining and compressing ACK/NACK bits by a logical operation (eg, logical AND operation) and transmitting will be described in detail.

In the LTE TDD system, a plurality of ACK/NACK bits (per TB) corresponding to PDSCHs received by a terminal in a plurality of DL subframes (SF) according to UL/DL settings are transmitted by a single PUCCH resource in a single UL SF. Sending can occur. At this time, the total number of bits (X ₁ ) corresponding to the plurality of ACK/NACK bits (per TB) may be larger than the maximum UCI payload size (X ₂ ) supported by the PUCCH resource (ie, X ₁ >). X ₂ ). In this case, the terminal may transmit ACK/NACK information compressed by applying a logical operation (logical AND operation) to a plurality of ACK/NACK bits (for each TB) using the PUCCH resource.

On the other hand, in the NR system to which the present invention is applicable, unlike the terminal in the existing LTE system in which the terminal transmits ACK/NACK for each TB, the terminal is configured by setting CBGs for a plurality of CBs forming the TB. ACK/NACK can be sent for each CBG.

Further, in the NR system to which the present invention is applicable, flexibility is an important design philosophy in order to support various services. Therefore, when a scheduling unit in the NR system is called a slot, an arbitrary slot in the NR system is a PDSCH (= physical channel for transmitting DL data) transmission slot (hereinafter, DL slot) or a PUSCH (= physical data for transmitting UL data). It is possible to support a structure (hereinafter, Dynamic DL/UL configuration) capable of dynamically changing a channel) transmission slot (hereinafter, UL slot).

Further, in the NR system to which the present invention is applicable, in the case of supporting Dynamic DL/UL configuration, if HARQ-ACK transmission is not required to have a delay too high (Latency), HARQ-ACK for each DL slot is PUCCH resource. The operation of combining HARQ-ACKs for a plurality of DL slots and transmitting with one PUCCH resource (=physical channel for transmitting UL control such as HARQ-ACK and/or CSI) is not UL. It is preferable in that the control overhead can be reduced.

FIG. 11 is a diagram simply showing an ACK/NACK bundling operation applicable to the present invention.

In this case, as shown in FIG. 11, the terminal can collect a plurality of HARQ-ACKs for a plurality of DL slots and transmit them with a single PUCCH resource.

Hereinafter, a method of transmitting/receiving ACK/NACK information between a terminal and a base station in an NR system to which the present invention is applicable will be described in detail.

3.1. First ACK/NACK transmission/reception method

The terminal performs ACK/NACK bundling by one of the following methods for a plurality of ACK/NACK bits (for each CBG) corresponding to a plurality of PDSCHs (or transport block (TB) or CBG) and PUCCH It can be transmitted using resources.

(1) Option 1: ACK/NACK bundling (example: logical AND operation) for ACK/NACK bits (for each CBG) corresponding to the corresponding TB (or slot) is performed for each TB (or slot).

-The total ACK/NACK payload size after ACK/NACK bundling is the same as the total number of TBs (or slots) (the target of ACK/NACK transmission).

-At this time, PUCCH resources are allocated as follows.

-Option 1-1: PUCCH resource is allocated for each TB (or slot)

-Option 1-2: (ACK/NACK transmission target) Allocates a single PUCCH resource to the entire TB (or slot)

(2) Option 2: ACK/NACK bundling (example: logical AND operation) for ACK/NACK bits (for each CBG) corresponding to the same CBG index is performed for each CBG index.

-The total ACK/NACK payload size after ACK/NACK bundling is the same as the number of (total ACK/NACK transmission target) CBGs.

-At this time, PUCCH resources are allocated as follows.

-Option 2-1: PUCCH resource is allocated for each CBG index

-Option 2-2: (ACK/NACK transmission target) Allocate a single PUCCH resource to the entire CBG

(3) Option 3: ACK/NACK bundling (example: logical AND operation) for the entire ACK/NACK bit (for each CBG) is performed.

-The total ACK/NACK payload size after ACK/NACK bundling is 1 bit.

-At this time, PUCCH resources are allocated as follows.

-Option 3-1: Allocating a single PUCCH resource

(4) Option 4: Calculate (consecutive) ACK counter value for all ACK/NACK bits (per CBG)

-The above (consecutive) ACK counter means the number of consecutive ACKs.

-The total ACK/NACK payload size after ACK/NACK bundling is bits.

-At this time, PUCCH resources are allocated as follows.

-Option 4-1: Allocates a single PUCCH resource (for the purpose of 2-bit ACK counter transmission)

If the terminal can support all of Option 1 and Option 2 described above, the terminal can determine which of the two methods is used to perform ACK/NACK bundling. After that, the terminal reports the (1 bit) information for the scheme that is actually applied among the above-mentioned Option 1 and Option 2 to the base station by utilizing the additional bit (in the PUCCH resource), or Option 1 or Option 2 It is possible to inform the base station of the scheme applied by the terminal by applying different CRC masking to the CRC (Cyclic Redundancy Check) bit applied to UCI.

-When performing ACK/NACK bundling, if the CBG-based retransmission PDSCH is included, does the terminal consider only ACK/NACK bits (per CBG) for the scheduled CBG (as a target of ACK/NACK bundling)? Alternatively, ACK/NACK bits (for each CBG) for all CBGs set in the corresponding PDSCH can be considered (as ACK/NACK bundling targets).

FIG. 12 is a diagram schematically illustrating an ACK/NACK bundling method according to an example of the present invention.

As an example, the number of CBGs that can be transmitted (maximum) in one DL slot is set to M, and the terminal responds to a plurality of ACK/NACK bits (per CBG) corresponding to N DL slots (or PDSCHs). It is assumed that ACK/NACK bundling is performed.

In this case, as shown in FIG. 12, the terminal logically operates M (for each CBG) ACK/NACK bits for each DL slot (or TB) for the corresponding DL slot (or TB). The ACK/NACK bundling can be performed by a method of combining with each other and compressing to 1 bit (that is, ACK/NACK bundling per slot (or TB)). According to this, N-bit size ACK/NACK information can be generated for all N DL slots (or TBs). Therefore, the terminal can transmit on the PUCCH resource to which N-bit size ACK/NACK information is allocated. At this time, a single PUCCH resource is allocated to the terminal, or an (independent) PUCCH resource is allocated for each DL slot (or TB).

FIG. 13 is a diagram schematically illustrating an ACK/NACK bundling method according to another example of the present invention.

Further, as a method for the terminal to perform ACK/NACK bundling on a plurality of ACK/NACK bits (for each CBG) corresponding to N DL slots (or PDSCH), a method of performing ACK/NACK bundling for each CBG index is considered. To be At this time, when the number of (maximum) CBGs that can be transmitted in one DL slot is set to M, the CBG index (in the DL slot) can be defined as 0, 1,..., M-1. ..

In this case, as shown in FIG. 13, the terminal selects only ACK/NACK bits (for each CBG) having the same CBG index for a plurality of ACK/NACK bits (for each CBG), and then performs a logical operation. ACK/NACK bundling can be performed by a method of combining (logical AND Operation) and compressing to 1 bit (that is, ACK/NACK bundling per CBG index). According to this, M-bit size ACK/NACK information is generated for all N DL slots (or TBs). Therefore, the terminal can transmit on the PUCCH resource to which M-bit size ACK/NACK information is allocated. At this time, a single PUCCH resource is allocated to the terminal, or an (independent) PUCCH resource is allocated for each DL slot (or TB).

Further, due to data scheduling on multiple carriers (or scheduled from multiple carriers), it may be necessary to significantly reduce the ACK/NACK payload size transmitted on each carrier. In this case, the terminal performs a logical AND operation on all the ACK/NACK bits (for each CBG) corresponding to the plurality of PDSCHs (for transmission of ACK/NACK) (or transport block (TB) or CBG). Can be applied to compress to 1 bit. At this time, the terminal can transmit 1-bit ACK/NACK information on a single (allocated) PUCCH resource.

As a modified operation of ACK/NACK bundling, the terminal reports only information on the number of consecutive ACKs to a plurality of ACK/NACK bits (per CBG) corresponding to N DL slots (or PDSCHs) to the PUCCH resource. be able to. As an example, if N=4 and the number of (maximum) CBGs that can be transmitted in one DL slot is set to M=4, the terminal reports 16-bit ACK/NACK bits (per CBG). Alternatively, the case where the number of consecutive ACKs is 1, 2,..., 16 can be expressed as a 4-bit (consecutive) ACK counter and reported to the base station using the PUCCH resource.

Furthermore, when the terminal attempts to compress the ACK/NACK bits (per CBG) corresponding to the PDSCHs (or transport block (TB) or CBG), the terminal may use the entire PDSCH (or transport block (TB) or CBG) is composed of N subsets, and among the subsets, M (where M<N) subsets in which NACKs are present are represented, and ACK/ NACK information can be configured. At this time, since M<N, the terminal can utilize the Combined Index method. As a result, the UCI payload size for ACK/NACK information can be greatly reduced.

The above-mentioned first ACK/NACK transmission/reception method can be combined and applied unless it conflicts with other proposals of the present invention.

3.2. Second ACK/NACK transmission/reception method

When a terminal performs ACK/NACK bundling on multiple ACK/NACK bits (per CBG) corresponding to multiple PDSCHs (or transport block (TB) or CBG), the terminal can send (transmittable) ACK/NACK payload size Allows progressive ACK/NACK bundling as follows.

More specifically, the terminal may perform ACK/NACK bundling on ACK/NACK bits (for each CBG) corresponding to each data transmission unit for some N data transmission units of the whole. it can. At this time, the data transmission unit is one of the following.

(1) CBG subset

(2) TB (or PDSCH or DL slot)

(3) TB (or PDSCH or DL slot) group

(4) Carrier

Here, the N value is determined by the (transmittable) ACK/NACK payload size.

As a specific example, assume that the (maximum) number of CBGs in one DL slot is set to 4, and the terminal transmits ACK/NACK bits (per CBG) for a total of 8 DL slots in a single PUCCH resource. To do. In this case, it is assumed that there is a total of 4*8=32 ACK/NACK bits (per CBG) and the ACK/NACK payload size that the terminal can transmit with the PUCCH resource is 0 bit. In this case, the terminal does not perform ACK/NACK bundling for a plurality of CBGs in each DL slot, but only performs ACK/NACK bundling for CBGs in one DL slot out of eight DL slots to obtain ACK/NACK information. Can be sent. According to such ACK/NACK bundling, the terminal can adjust the size of ACK/NACK information to be transmitted (4*7+1=29 bits) within 30 bits which is the ACK/NACK payload size that can be transmitted by the PUCCH resource. it can.

As another example, assume that the ACK/NACK payload size that can be transmitted on the PUCCH resource is 20 bits. In this case, the terminal performs ACK/NACK bundling on a plurality of CBGs for each DL slot in four DL slots out of eight DL slots, so that the entire 4*4+4=20-bit size ACK/NACK information. Can be generated to match the 20-bit ACK/NACK payload size that can be transmitted on the PUCCH resource.

Such a second ACK/NACK transmission/reception method has a lower ACK/NACK resolution for a specific DL slot (or TB) or data transmission unit than the above-described first ACK/NACK transmission/reception method. However, there is an advantage that the overall ACK/NACK payload size can be adjusted with higher granularity.

The above-mentioned second ACK/NACK transmission/reception method can be applied by being combined together unless it conflicts with other proposals of the present invention.

3.3. Third ACK/NACK transmission/reception method

The terminal performs ACK/NACK bundling for a plurality of ACK/NACK bits (for each CBG) corresponding to a plurality of PDSCHs (or a transport block (TB) or a CBG) for a plurality of carriers as follows, and transmits the PUCCH resources. be able to.

More specifically, the terminal can perform ACK/NACK bundling for each carrier by the ACK/NACK bundling method in the first ACK/NACK transmission/reception method described above. At this time, the bundled ACK/NACK bits for each carrier can be multiplexed (in terms of ACK/NACK payload structure) for multiple carriers and transmitted in a single PUCCH resource (ie, bundled A/ N multiplexing cross multiple carriers).

That is, when the terminal performs ACK/NACK bundling on a plurality of ACK/NACK bits (for each CBG) corresponding to a plurality of PDSCHs (or transport block (TB) or CBG) received from a plurality of carriers, the terminal After performing ACK/NACK bundling according to the first ACK/NACK transmission/reception method described above for each, bundled ACK/NACK for multiple carriers is multiplexed (in terms of ACK/NACK payload configuration) and a single PUCCH resource is used. Can be sent.

The third ACK/NACK transmission/reception method described above can be combined and applied unless it conflicts with other proposals of the present invention.

Hereinafter, the PDSCH that is the ACK/NACK transmission target is set for the specific PUCCH transmission resource, and the terminal ACK/NACK bundling operation for the ACK/NACK bit (for each TB or each CBG) for the specific PDSCH among PDSCHs. If it is possible, the ACK/NACK bundling method of the terminal and the ACK/NACK transmission/reception method based thereon will be described in detail.

3.4. Fourth ACK/NACK transmission/reception method

When a terminal performs ACK/NACK bundling on multiple ACK/NACK bits (per CBG) corresponding to multiple PDSCHs (or transport block (TB) or CBG), the terminal can send (transmittable) ACK/NACK payload size Allows progressive Inter-CBG bundling (per TB index) as follows.

(1) Option 1: Inter-CBG bundling (per TB index) is gradually performed in TB units.

-ACK/NACK bundling is performed only when ACK/NACK payload size> maximum PUCCH payload size, and is performed as follows.

If the Inter-CBG bundling (per TB index) is not performed until now, the Inter-CBG bundling (per TB index) for the first TB is performed.

If the Inter-CBG bundling (per TB index) for the kth TB has been performed so far, the Inter-CBG bundling (per TB index) for the (k+1)th TB is performed.

-The TB order can use one of the following methods.

--Alt 1: The larger (or smaller) the CC index, the larger (or smaller) the slot index (within the same CC index), and the larger the TB index (within the same slot index) (or The smaller the order, the faster the order.

--Alt 2: The larger (or smaller) the slot index, the larger (or smaller) the CC index (within the same slot index), and the larger the TB index (within the same CC index) (or The smaller the order, the faster the order.

The larger (or smaller) the Alt 3: Counter-DAI index, the earlier the order.

(2) Option 2: Inter-CBG bundling (per TB index) is gradually performed in PDSCH (or slot) units.

-ACK/NACK bundling is performed only when ACK/NACK payload size> maximum PUCCH payload size, and is performed as follows.

If the Inter-CBG bundling (per TB index) is not performed until now, the Inter-CBG bundling (per TB index) for the first PDSCH (or slot) is performed.

---If Inter-CBG bundling (per TB index) for the k-th PDSCH (or slot) has been performed so far, inter-CBG bundling (per TB index) for the (k+1)-th PDSCH (or slot) is performed. ..

-The PDSCH (or slot) order can use one of the following methods.

--Alt 1: The higher (or smaller) the CC index, and the larger (or smaller) the slot index (within the same CC index), the earlier the order.

--Alt 2: The larger (or smaller) the slot index, and the larger (or smaller) the CC index (within the same slot index), the earlier the order.

The larger (or smaller) the Alt 3: Counter-DAI index, the earlier the order.

(3) Option 3: Inter-CBG bundling (per TB) is gradually performed in CC (component carrier) units.

-ACK/NACK bundling is performed only when ACK/NACK payload size> maximum PUCCH payload size, and is performed as follows.

If the Inter-CBG bundling (per TB index) is not performed until now, the Inter-CBG bundling (per TB index) for the first CC is performed.

If the Inter-CBG bundling (per TB index) for the kth slot has been performed so far, the Inter-CBG bundling (per TB index) for the (k+1)th CC is performed.

The CC order can use one of the following methods.

--- Alt 1: The larger (or smaller) the CC index, the earlier the order.

The larger (or smaller) the Alt-2:Counter-DAI index, the earlier the order.

(4) Option 4: Inter-CBG bounding (per TB index) for all PDSCHs (or all ACK/NACK transmission targets) (or all slot/CC combinations or all counter DAI index values) at once To do.

Here, the Inter-CBG bundling (per TB index) is an operation of performing ACK/NACK bundling on ACK/NACK bits (for each CBG) corresponding to CBGs (having the same TB index) in PDSCH. means.

At this time, the ACK/NACK payload size is updated each time Inter-CBG bundling (per TB index) is performed, and the maximum PUCCH payload size means the maximum payload size that can be transmitted on the PUCCH.

As a result, the terminal gradually performs Inter-CBG bundling (per TB index), and the total of the (updated) ACK/NACK payload size can be transmitted on PUCCH. Maximum ACK/NACK payload size (= maximum PUCCH payload) If it becomes smaller, the Inter-CBG bundling (per TB index) cannot be performed any more.

In addition, when the CBG is not set in the target TB of the Inter-CBG bundling (per TB index), the terminal can omit the ACK/NACK bundling for the CBG in the corresponding TB.

14 to 17 are diagrams schematically showing an ACK/NACK bundling method for each option of the fourth ACK/NACK transmission/reception method according to the present invention, and an ACK/NACK transmission/reception method based on the method.

More specifically, FIG. 14 is a diagram schematically illustrating a configuration in which progressive Inter-CBG bundling (per TB index) in TB units is performed, and FIG. 15 illustrates a progressive Inter-CBG bounding in PDSCH (or slot) units. -CBG bundling (per TB index) is a diagram schematically showing a configuration is performed, FIG. 16 is a diagram briefly showing a configuration in which CC unit progressive Inter-CBG bundling (per TB index) is performed, FIG. 17 is a diagram briefly showing a configuration in which collective Inter-CBG bundling (per TB index) is performed on the entire PDSCH.

As a specific example, the terminal may perform inter-CBG bundling (hereinafter, progressive It is assumed that Inter-CBG bundling (per TB index) is performed. In this case, the ACK/NACK transmission/reception method for each option described above is shown in FIGS. 14 to 17.

14 to 17, the larger the CC index, the larger the slot index (within the same CC index), the larger the TB index (within the same slot index), and the Inter-CBG bundling (per TB index). Assuming that the application order is fast, the shaded part means a unit (i.e., TB) in which the Inter-CBG bundling (per TB index) is performed, and the numbers are the Inter-CBG bundling (per TB index). Means the order in which is applied.

The above-mentioned fourth ACK/NACK transmission/reception method can be combined and applied unless it conflicts with other proposals of the present invention.

3.5. Fifth ACK/NACK transmission/reception method

When a terminal performs ACK/NACK bundling for multiple (per CBG) ACK/NACK bits corresponding to multiple PDSCHs (or transport block (TB) or CBG), the terminal depends on the (transmittable) ACK/NACK payload size. , Progressive Inter-TB bundling (per CBG index) can be performed as follows.

(1) Option 1: Inter-TB bundling (per CBG index) is gradually performed in PDSCH (or slot) units.

-ACK/NACK bundling is performed only when ACK/NACK payload size> maximum PUCCH payload size, and is performed as follows.

If the Inter-TB bundling (per CBG index) is not performed until now, the Inter-TB bundling (per CBG index) for the first slot is performed.

If the Inter-TB bundling (per CBG index) for the kth slot has been performed so far, the Inter-TB bundling (per CBG index) for the (k+1)th slot is performed.

-The PDSCH (or slot) order can use one of the following methods.

--Alt 1: The higher (or smaller) the CC index, and the larger (or smaller) the slot index (within the same CC index), the earlier the order.

--Alt 2: The larger (or smaller) the slot index, and the larger (or smaller) the CC index (within the same slot index), the earlier the order.

The larger (or smaller) the Alt 3: Counter-DAI index, the earlier the order.

(2) Option 2: Inter-TB bundling (per CBG index) is gradually performed in CC units.

-ACK/NACK bundling is performed only when ACK/NACK payload size> maximum PUCCH payload size, and is performed as follows.

If the Inter-TB bundling (per CBG index) is not performed until now, the Inter-TB bundling (per CBG index) for the first CC is performed.

If the Inter-TB bundling (per CBG index) for the kth slot has been performed so far, the Inter-TB bundling (per CBG index) for the (k+1)th CC is performed.

The CC order can use one of the following methods.

--- Alt 1: The larger (or smaller) the CC index, the earlier the order.

The larger (or smaller) the Alt-2:Counter-DAI index, the earlier the order.

(3) Option 3: Inter-TB bundling (per CBG index) for all PDSCHs (or all ACK/NACK transmission targets) (or all slot/CC combinations or all counter DAI index values) To do.

Here, the Inter-TB bundling (per CBG index) is ACK/NACK bundling for ACK/NACK bits (for each CBG) corresponding to a plurality of TBs (having the same CBG index) in the PDSCH. Means an action.

Also, the ACK/NACK payload size is updated every time Inter-TB bundling (per CBG index) is performed, and the maximum PUCCH payload size means the maximum payload size that can be transmitted by PUCCH.

As a result, the terminal gradually performs Inter-TB bundling (per CBG index), and the total of (updated) ACK/NACK payloads is the maximum ACK/NACK payload size that can be transmitted on PUCCH (= maximum PUCCH payload). ) Becomes smaller, it is possible to perform no more Inter-TB bundling (per CBG index).

Also, when there is one TB in the target PDSCH for inter-TB bundling (per CBG index), the terminal can omit ACK/NACK bundling for the TB in the corresponding PDSCH.

18 to 20 are diagrams schematically showing an ACK/NACK bundling method for each option of the fifth ACK/NACK transmission/reception method according to the present invention and an ACK/NACK transmission/reception method based on the method.

More specifically, FIG. 18 is a diagram schematically illustrating a configuration in which PDSCH (or slot)-based gradual Inter-TB bundling (per CBG index) is performed, and FIG. 19 is a CC-based gradual Inter-interval. -TB bundling (per CBG index) is a diagram briefly showing a configuration, and FIG. 20 is a diagram briefly showing a configuration in which a batch Inter-TB bundling (per CBG index) is performed for the entire PDSCH.

As a specific example, a terminal may perform gradual Inter-CBG bundling (hereinafter, gradual) on PDSCHs corresponding to three CCs (eg, CC index 0, CC index 1, CC index 2) and three slots. It is assumed that Inter-CBG bundling (per TB index) is performed. In this case, the ACK/NACK transmission/reception method for each option described above is shown in FIGS.

In FIGS. 18 to 20, the larger the CC index, the larger the slot index (within the same CC index), the faster the order of applying the Inter-CBG bundling (per CBG index), and the shaded area is shown. The part indicates the unit in which the Inter-CBG bundling (per CBG index) is performed (that is, PDSCH), and the number indicates the order in which the Inter-CBG bundling (per CBG index) is applied.

The fifth ACK/NACK transmission/reception method described above can be applied by being combined together unless it conflicts with other proposals of the present invention.

3.6. Sixth ACK/NACK transmission/reception method

When the terminal performs ACK/NACK bundling for multiple ACK/NACK bits (per CBG) corresponding to multiple PDSCHs (or transport block (TB) or CBG), the terminal can send (transmittable) ACK/NACK payload size The gradual inter-slot bundling can be performed by the following.

(1) Option 1: Inter-Slot bundling is gradually performed in CC units.

-ACK/NACK bundling is performed only when ACK/NACK payload size> maximum PUCCH payload size, and is performed as follows.

When inter-slot bundling is not performed until now, inter-slot bundling is performed on the first CC.

When inter-slot bundling is performed on the k-th slot so far, inter-slot bundling is performed on the (k+1)th CC.

The CC order can use one of the following methods.

--- Alt 1: The larger (or smaller) the CC index, the earlier the order.

The larger (or smaller) the Alt-2:Counter-DAI index, the earlier the order.

(2) Option 2: Inter-Slot bundling is performed collectively for all PDSCHs (which are the targets of ACK/NACK transmission) (or all slot/CC combinations or all counter DAI index values).

Here, the Inter-Slot bundling is an ACK/NACK bit for each TB (or each CBG) corresponding to a plurality of TBs (or CBGs having the same TB index (and the same CBG index)) in CC. It means an operation of performing ACK/NACK bundling.

At this time, the ACK/NACK payload size is updated every time inter-slot bundling is performed, and the maximum PUCCH payload size means the maximum payload size that can be transmitted by PUCCH.

By this, the terminal gradually performs Inter-Slot bundling, and when the total of the (updated) ACK/NACK payload size becomes smaller than the maximum ACK/NACK payload size (= maximum PUCCH payload) that can be transmitted by PUCCH, Inter-Slot bundling may not be performed any further.

Also, when there is one slot in the inter-slot bundling target CC, the terminal can omit ACK/NACK bundling for the slot in the corresponding CC.

21 and 22 are diagrams schematically showing an ACK/NACK bundling method for each option of the sixth ACK/NACK transmission/reception method according to the present invention and an ACK/NACK transmission/reception method based on the method.

More specifically, FIG. 21 is a diagram briefly showing a configuration in which progressive inter-slot bundling is performed in CC units, and FIG. 22 briefly shows a configuration in which collective inter-slot bundling is performed on the entire PDSCH. It is a figure.

As a specific example, a terminal may perform gradual inter-slot bundling (hereinafter, gradual inter-bundling on PDSCHs corresponding to three CCs (eg, CC index 0, CC index 1, CC index 2) and three slots). Inter-Slot bundling) is performed. In this case, the ACK/NACK transmission/reception method for each option described above can be expressed as shown in FIGS.

21 and 22, it is assumed that the higher the CC index, the faster the application order of the Inter-Slot bundling is, and the shaded portion means a unit (i.e., CC) in which the Inter-Slot bundling is performed. Means the order in which the Inter-Slot bundling is applied. In addition, in FIGS. 21 and 22, the light shaded area and the dark shaded area respectively indicate inter-slot bundling for different indexes.

The sixth ACK/NACK transmission/reception method described above can be combined and applied unless it conflicts with other proposals of the present invention.

In addition, the terminal may use the progressive ACK/NACK transmission/reception method, the fifth ACK/NACK transmission/reception method, and the sixth ACK/NACK transmission/reception method to gradually change the inter-CBG (or inter-TB or When performing inter-Slot) bundling, the order in which the progressive ACK/NACK BUNDLING is applied to a plurality of PDSCHs is as follows: TM (transmission mode) applied to each PDSCH and CBG-based (re)transmission setting It depends on

More specifically, when TM1 means a transmission mode based on Singe TB and TM2 means a transmission mode based on Two TB, the terminal performs progressive Inter-TB bundling (per CBG index) on PDSCH which is TM2. It can be applied with priority.

As yet another example, when CBG-based (re)transmission/HARQ-ACK transmission is set for the PDSCH in CC1 and not set for the PDSCH in CC2, a gradual Inter-CBG bundling( The order of application of (per TB index) is that CC1 (where CBG-based (re)transmission/HARQ-ACK transmission is set) is set earlier than CC2.

3.7. Seventh ACK/NACK transmission/reception method

One or more of the following progressive ACK/NACK bundling techniques, such as the fourth ACK/NACK transmission/reception method, the fifth ACK/NACK transmission/reception method, and the sixth ACK/NACK transmission/reception method described above. If helped,

(1) Progressive Inter-CBG bundling (per TB index) (Example: Fourth ACK/NACK transmission/reception method)

(2) Progressive Inter-TB bundling (per CBG index) (Example: Fifth ACK/NACK transmission/reception method)

(3) Progressive inter-slot bundling (eg, sixth ACK/NACK transmission/reception method)

The terminal can apply ACK/NACK bundling as follows.

1) Option 1: After performing batch Inter-CBG bundling (per TB index) (for the entire PDSCH to be ACK/NACK transmission target)

-ACK/NACK payload size> maximum PUCCH payload size

--Option 1-A: Perform progressive Inter-TB bundling (per CBG index).

--- Option 1-B: Perform progressive Inter-Slot bundling.

-Otherwise, do not perform further ACK/NACK bundling.

2) Option 2: After performing collective Inter-TB bundling (per CBG index) (for the entire PDSCH to be ACK/NACK transmission target),

-ACK/NACK payload size> maximum PUCCH payload size

--Option 2-A: Perform progressive Inter-CBG bundling (per TB index).

--Option 2-B: Perform progressive Inter-Slot bundling.

-Otherwise, do not perform further ACK/NACK bundling.

At this time, the maximum PUCCH payload size means the maximum payload size that can be transmitted on the PUCCH.

Specifically, it is assumed that four CBGs are set for each TB and the terminal performs ACK/NACK bundling on three PDSCHs transmitting two TBs.

In this case, the ACK/NACK payload size before ACK/NACK bundling is 3 (number of PDSCH)*2 (number of each PDSCH)*4 (number of CBG of each TB)=24 bits. At this time, if the maximum PUCCH payload size that can be transmitted by the PUCCH resource is 4 bits, first, the terminal applies collective Inter-CBG bundling (per TB index) to the entire PDSCH to convert 24 bits to 6 bits. Can be compressed. After that, when the terminal performs gradual Inter-Slot bundling, it performs Inter-TB bundling (per CBG index) on two PDSCHs among the three PDSCHs, and the total ACK/NACK payload is 2+1+1=4 bits. Can be further compressed.

If this feature is generalized, Inter-CBG bundling (per TB index) and/or Inter-TB bundling (per CBG index) and/or Inter-Slot bundling (for the entire ACK/NACK target PDSCH) are ( When applied, the terminal is still gradual inter-CBG (or inter-TB or inter-Slot) when ACK/NACK payload size>maximum PUCCH payload size is still after applying ACK/NACK bundling. Bundling can be applied.

The seventh ACK/NACK transmission/reception method described above can be applied by being combined together unless it conflicts with other proposals of the present invention.

3.8. Eighth ACK/NACK transmission/reception method

For N PDSCHs (transmitted within a specific carrier), M TBs are transmitted for each PDSCH, and L CBGs are set for each TB, the terminal is assigned to multiple PDSCHs. ACK/NACK bundling can be performed on the corresponding ACK/NACK by one of the following methods.

(1) Option 1: Inter-CBG bundling (per TB index)

ACK/NACK bundling is performed on ACK/NACK bits (for each CBG) corresponding to a plurality of CBGs (having the same TB index) in PDSCH.

-Total ACK/NACK payload size is N*M bits

-The PUCCH resource is set in one of the following ways:

-Transmit N*M bits on a single PUCCH resource for multiple PDSCHs

--Transmit M bits on a single PUCCH resource for each PDSCH (i.e. a total of N PUCCH resources)

(2) Option 2: Inter-TB bundling (per CBG index)

-ACK/NACK bundling is performed on ACK/NACK bits (for each CBG) corresponding to a plurality of TBs (having the same CBG index) in PDSCH.

-Total ACK/NACK payload size is N*L bits

-The PUCCH resource is set in one of the following ways:

--Transmit N*L bits on a single PUCCH resource for multiple PDSCHs

--Transmit L bits on a single PUCCH resource for each PDSCH (ie, a total of N PUCCH resources)

(3) Option 3: Inter-Slot bundling

Perform ACK/NACK bundling on ACK/NACK bits for each TB (or for each CBG) having the same TB index (and CBG index) in CC.

-The total ACK/NACK payload size is M*L bits

-The PUCCH resource is set in one of the following ways:

--Transmit M*L bits on a single PUCCH resource

However, when the above scheme is applied, a Counter-DAI (downlink assignment index) field indicating the PDSCH order is required in the DL scheduling DCI.

(4) Option 4: inter-TB/CBG bounding (per PDSCH) (Option 1+Option 2)

ACK/NACK bundling is performed on ACK/NACK bits for each TB (or CBG) corresponding to all TBs (or CBGs) in PDSCH.

-Total ACK/NACK payload size is N bits

-The PUCCH resource is set in one of the following ways:

--Transmit N bits on a single PUCCH resource

--Transmit 1 bit on a single PUCCH resource for each PDSCH (ie a total of N PUCCH resources)

5) Option 5: Inter-CBG bundling (per TB index)+Inter-Slot bundling(Option 1+Option 3)

-After performing ACK/NACK bundling on ACK/NACK bits (for each CBG) corresponding to a plurality of TBs (having the same CBG index) in PDSCH, a plurality of PDSCHs having the same TB index in CC ACK/NACK bundling is performed on the (bundled) ACK/NACK bits corresponding to each TB.

-Total ACK/NACK payload size is M bits

-The PUCCH resource is set in one of the following ways:

--Transmit M bits on a single PUCCH resource

However, when the above scheme is applied, a Counter-DAI (downlink assignment index) field indicating the PDSCH order is required in the DL scheduling DCI.

(6) Option 6: Inter-TB bundling (per CBG index)+Inter-Slot bundling (Option 2+Option 3)

-After performing ACK/NACK bundling on ACK/NACK bits (for each CBG) corresponding to multiple TBs (having the same CBG index) in PDSCH, then performing multiple ACK/NACK bundlings having the same CBG index in CC ACK/NACK bundling is performed on (bundled) ACK/NACK bits for each CBG corresponding to PDSCH.

-Total ACK/NACK payload size is L bits

-The PUCCH resource is set in one of the following ways:

--Transmit L bits on a single PUCCH resource

However, when the above scheme is applied, a Counter-DAI (downlink assignment index) field indicating the PDSCH order is required in the DL scheduling DCI.

(7) Option 7: Inter-TB/CBG bundling (per PDSCH)+Inter-Slot bundling (Option 4 +Option 3)

-After performing ACK/NACK bundling on ACK/NACK bits for each TB (or CBG) corresponding to all TBs (or CBGs) in PDSCH, ACK corresponding to a plurality of PDSCHs in CC (bundled) ACK/NACK bundling is performed on the /NACK bit.

-Total ACK/NACK payload size is 1 bit

-The PUCCH resource is set in one of the following ways:

--Transmit 1 bit on a single PUCCH resource

However, when the above scheme is applied, a Counter-DAI (downlink assignment index) field indicating the PDSCH order is required in the DL scheduling DCI.

(8) Option 8: (Continuous) ACK counter

-Mapping the total (continuous) ACK number while cycling to the QPSK constellation.

-Total ACK/NACK payload size is 2 bits

-The PUCCH resource is set in one of the following ways:

--Transmit 2 bits on a single PUCCH resource

However, when the above scheme is applied, a Counter-DAI (downlink assignment index) field indicating the PDSCH order is required in the DL scheduling DCI.

Here, the maximum PUCCH payload size means the maximum payload size that can be transmitted on the PUCCH.

In addition, the base station sets one of the ACK/NACK bundling schemes in the terminal by an upper layer signal, or sets a plurality of ACK/NACK bundling schemes in the terminal in advance by an upper layer signal and then sets the above by DCI. Of the above methods, one ACK/NACK bundling method can be designated. Also, the terminal can select and apply one of the ACK/NACK bundling schemes according to a specific rule.

As a specific example, the terminal has a ratio (e.g., R) between an ACK/NACK payload size before performing ACK/NACK bundling and a (maximum) UCI payload size (hereinafter, maximum PUCCH payload size) that can be transmitted by PUCCH. =(ACK/NACK payload size)/(maximum PUCCH payload size)), it is possible to select and apply one of the plurality of Options described above.

As an example, for N PDSCHs (transmitted in a specific carrier), M TBs are transmitted for each PDSCH, and L CBGs are set for each TB, ACK/NACK. The size of ACK/NACK bits (for each CBG) before applying bundling is N*M*L bits. At this time, the ratio of compression of the ACK/NACK payload size for each Option described above (hereinafter, ACK/NACK compression ratio) is as shown in the following table.

As an example, when N=4, m=2, L=4, and when the UCI payload size that can be transmitted by PUCCH is limited and the ACK/NACK payload size is compressed by 1/3 or more, the terminal uses Option 1 ( 1/4) or Option 3(1/4) can be applied (or the base station can instruct the terminal to apply Option 1(1/4) or Option 3(1/4)).

At this time, the terminal basically applies the ACK/NACK bundling option having the maximum ACK/NACK compression rate among the ACK/NACK bundling options smaller than the required ACK/NACK compression rate, but the same ACK/NACK bundling option. When there are a plurality of ACK/NACK bundling options having a compression rate, the smaller the ACK/NACK bundling range, the higher the priority (eg, Option 1>Option 2>Option 3; Option 4>Option 5>Option 6). ).

The eighth ACK/NACK transmission/reception method described above can be applied by being combined together unless it conflicts with other proposals of the present invention.

3.9. Ninth ACK/NACK transmission/reception method

An ACK/NACK transmission target (slot index) set (transmitted by PUCCH) is set for the terminal (for a specific carrier), and the terminal (inter-Slot) ACK/for the PDSCH actually scheduled in the set. When performing a NACK bundle operation, the DL scheduling missing problem for a specific PDSCH in the set can be solved as follows.

(1) When Counter-DAI exists (in the DL scheduling DCI)

-Option 1-1: Set different ARI (ACK/NACK resource indicator) values (in DL scheduling DCI) for each Counter-DAI value

As an example, the ARI value is a value obtained by applying the modulo M operation to the PDSCH scheduling order value that is inferred as the Counter-DAI value (where M can be the total number of ARI states).

-Option 1-2: PUCCH resource allocation according to Counter-DAI value

--As an example, PUCCH resources are allocated based on a function that takes a Counter-DAI value as an input.

-Option 1-3: PUCCH resource group is indicated by ARI, and one PUCCH resource in the PUCCH resource group is selected by the Counter-DAI value.

(2) When Counter-DAI does not exist (in the DL scheduling DCI)

-Option 2-1: (In DL scheduling DCI) The total number of PDSCHs to be transmitted for ACK/NACK is transmitted to the terminal by a Total-DAI value.

-Option 2-2: The terminal further reports one of the following information together with the ACK/NACK information.

--- (obvious) ACK/NACK payload size

--- Total-DAI value (as understood by the terminal)

--- Bitmap information indicating the presence/absence of DL scheduling missing for each PDSCH

Here, Counter-DAI means a bit field that informs the scheduling order between PDSCHs, and Total-DAI value means a bit field that informs the total number of scheduled PDSCHs.

Also, ARI (ACK/NACK resource indicator) means a bit field indicating a PUCCH resource.

As a specific example, an ACK/NACK transmission target (slot index) set (transmitted by PUCCH) can be configured with SF (or slot) positions that are back-calculated based on HARQ-ACK timing set in the terminal. That is, when n+4, n+5, n+6, and n+7 are set as HARQ-ACK timing (for n-th PDSCH reception) in the terminal, ACK/NACK transmission target for the PUCCH resource of the specific k-th slot (or subframe) The (slot index) set can be represented by the k-4th, k-5th, k-6th, and k-7th slots (or subframes).

At this time, when the terminal performs (Inter-Slot) ACK/NACK bundling on the (slot index) set, the terminal only receives (Inter-Slot) ACK/NACK information for ACK/NACK information corresponding to the scheduled PDSCH. It is preferable to perform NACK bundling.

However, the terminal may miss the DL scheduling DCI for PDSCH scheduled by the base station (eg, missing). In this case, the reporting of the terminal regarding the (bundled) ACK/NACK information and the interpretation of the base station may be different.

As an example, when a terminal performs (Inter-Slot) ACK/NACK bundling on a plurality of PDSCHs each having one TB, the base station schedules four PDSCHs, and the terminal only has three PDSCHs among them. Is received. At this time, if the terminal detects ACK for three PDSCHs and reports ACK with ACK/NACK, the base station mistakenly detects that all four PDSCHs scheduled by itself are ACK. You can judge.

Therefore, it is necessary to solve the problem of DL scheduling missing for PDSCH that is the target of ACK/NACK transmission between the base station and the terminal.

If the Counter-DAI is present, the order can be indicated between the PDSCHs scheduled in sequence by the Counter-DAI, so that the terminal can recognize the missed PDSCH scheduled in the middle. .. However, since a problem may occur when the terminal misses the PDSCH scheduled last, the present invention proposes the following solution.

As one method, the base station may allocate the value (or PUCCH resource) indicated by the ARI differently according to the Counter-DAI value (in the DL scheduling DCI) (or PDSCH scheduling order indicated by the Counter-DAI). ..

As an example, when the base station schedules up to the Mth PDSCH and the terminal detects up to the M-1th PDSCH, the terminal may be divided into PUCCH resources corresponding to the Mth PDSCH order. Since the ACK/NACK transmission is performed using the PUCCH resource corresponding to the PDSCH order, the base station can predict which PDSCH the terminal has received from the detection result of the PUCCH resource.

Alternatively, if there is no Counter-DAI, the base station can indicate the total number of PDSCHs to be scheduled in advance to the terminal using Total DAI. Correspondingly, when the terminal reports (bundled) ACK/NACK by (Inter-Slot) ACK/NACK bundling, the number indicated by Total DAI is larger than the total (received) PDSCH number recognized by the terminal, It is possible to judge that the DL scheduling misses for a specific PDSCH and report'All NACK' to the base station, or to omit the PUCCH transmission. Alternatively, the terminal indicates information regarding DL scheduling missing as additional information when reporting ACK/NACK (eg, (explicit) ACK/NACK payload size and/or Total DAI (from the terminal's point of view) and/or DL scheduling missing for each PDSCH. Bitmap information). In this case, the base station can determine the presence/absence of DCI missing from the additional information and reinterpret the ACK/NACK information reported by the terminal.

More specifically, the following Option can be considered as a PUCCH resource allocation method (when Counter-DAI exists in DCI and Inter-Slot bundling can be applied).

1) Option 3: Counter-DAI exists in DCI, and PUCCH resource is assigned differently for each Counter-DAI value (or PDSCH order value implied by Counter-DAI)

-Option 3-1: A single PUCCH resource is configured (independently) by a higher layer signal (eg, RRC signaling) for each ARI value, and a Counter-DAI value (or PDSCH order value implied by Counter-DAI) Assign different ARI values for each and assign PUCCH resources according to ARI values

-Option 3-2: A single PUCCH resource is set (independently) by a higher layer signal (eg, RRC signaling) for each ARI value, and a Counter-DAI value (or PDSCH order value implied by the Counter-DAI) is set. The same ARI value is assigned for each, and the last PUCCH resource is assigned by applying the Counter-DAI value (or PDSCH order value implied by the Counter-DAI) as an index offset value for the PUCCH resource indicated by the ARI.

-Option 3-3: A PUCCH resource set is set (independently) by a higher layer signal (eg, RRC signaling) for each ARI value, and for each Counter-DAI value (or PDSCH order value implied by Counter-DAI). The same ARI value is assigned to each, and different PUCCH resources in the PUCCH resource set indicated by the ARI are selected and assigned for each Counter-DAI value (or PDSCH order value implied by the Counter-DAI).

-Option 3-4: A single PUCCH resource is set (independently) by a higher layer signal (eg, RRC signaling) for each Counter-DAI value (or PDSCH order value implied by Counter-DAI) without ARI. , PUCCH resources are allocated by Counter-DAI value

2) Option 4: Counter-DAI and Total-DAI are present in DCI, the same ARI value is assigned to each Counter-DAI value (or PDSCH order value implied by Counter-DAI), and PUCCH resource is assigned according to the ARI value.

3) Option 5: Counter-DAI exists in DCI, Total-DAI exists in UCI, the same ARI value is assigned to each Counter-DAI value (or PDSCH order value implied by Counter-DAI), and ARI value is used. Allocates PUCCH resources

4) Option 6: existence of bitmap information regarding presence/absence of scheduling in UCI, the same ARI value is allocated to each Counter-DAI value (or PDSCH order value implied by Counter-DAI), and PUCCH resource allocation by ARI value

Further, when the Counter-DAI is present in the DCI and the (inter-Slot) ACK/NACK bundling (hereinafter, inter-DAI bundling) is applied to the slot to which the Counter-DAI value is given, the terminal uses one of the following: One method can be applied.

<1> Option 7: ACK/NACK bundling is performed for slots corresponding to all DAI values up to the last received DAI.

-For example, when DAI values of 1, 2, and 4 are received, the terminal performs DTX (no PUCCH Tx) or sends a bundled NACK on the PUCCH resource corresponding to DAI=4.

<2> Option 8: ACK/NACK bundling is performed only on the slot corresponding to the DAI value continuously received from the DAI initial value.

-As an example, when the DAI values 1, 2, and 4 are received, the terminal sends a bundled ACK/NACK for DAI=1 and DAI=2 on the PUCCH resource corresponding to DAI=2.

The ninth ACK/NACK transmission/reception method described above can be combined and applied unless it conflicts with other proposals of the present invention.

FIG. 23 is a flow chart showing a method of transmitting terminal acknowledgment information according to the present invention.

The terminal receives downlink data from the base station (S2310).

Generally, the received downlink data corresponds to N pieces (N is a natural number) of downlink data.

At this time, one downlink data includes M (M is a natural number) transmission blocks (Transmission Block; TB), and one TB includes L (L is a natural number) code block group (Code Block Group; CBG). including.

Therefore, the N downlink data includes a total of N*M*L CBGs.

Then, the terminal bundles the received acknowledgment information for the CBG included in the downlink (S2320).

More specifically, the terminal transmits acknowledgment information for a total of N*M*L CBGs included in N downlink data to X (X is greater than or equal to 1 and N Bundling to acknowledgment information of a bit size (natural number smaller than *M*L).

In the present invention, as the fixed rule, various rules can be applied as follows depending on the embodiment.

As an example, the certain rule corresponds to the first rule for bundling the acknowledgment information of all CBGs included in the same TB. At this time, the X corresponds to N*M.

As another example, the certain rule corresponds to a second rule for bundling acknowledgment information of all CBGs included in the same downlink data and having the same CBG index for each TB. At this time, the X corresponds to N*L.

As yet another example, the certain rule is included in TBs having the same TB index for each downlink data, and the acknowledgment information of all CBGs having the same CBG index for each TB is banded. Corresponds to the third rule to ring. At this time, the X corresponds to M*L.

As still another example, the certain rule corresponds to the fourth rule for bundling the acknowledgment information of all CBGs included in the same downlink data. At this time, the X corresponds to N.

As still another example, the certain rule bundles the acknowledgment information of all CBGs included in the same TB into the first acknowledgment information, and has the same TB index for each downlink data. It corresponds to the fifth rule for bundling the first acknowledgment information of all TBs to the second acknowledgment information. At this time, the X corresponds to M.

As still another example, the certain rule corresponds to the sixth rule for bundling the acknowledgment information of all CBGs having the same CBG index for all TBs included in the N downlink data. To do. At this time, the X corresponds to L.

As yet another example, the certain rule corresponds to the seventh rule for bundling acknowledgment information for N*M*L CBGs. At this time, the X corresponds to 1.

As still another example, the certain rule may perform bundling step by step on the acknowledgment information for N*M*L CBGs, and the acknowledgment information bundled up to Y (Y is a natural number) steps. Corresponds to the eighth rule to stop bundling if the size of is less than or equal to a certain bit size.

In this way, the terminal bundles the acknowledgment information for the received downlink data based on various rules. Then, the terminal transmits the bundling acknowledgment information to the base station (S2330).

Here, the acknowledgment information corresponds to HARQ ACK/NACK information for the received downlink data.

Also, the bundled acknowledgment information is transmitted via the PUCCH or PUSCH depending on the situation.

It is clear that one example of the above proposed scheme may be included as one of the implementation methods of the present invention and can be regarded as a kind of proposed scheme. In addition, the above-described proposed schemes may be implemented independently, or may be implemented in the form of a combination (or merge) of some proposed schemes. The information on whether or not the proposed method is applied (or the information on the rule of the proposed method) is defined by the rule so that the base station informs the terminal by a predefined signal (eg, physical layer signal or upper layer signal). May be done.

4. Device configuration

FIG. 24 is a diagram showing the configurations of a terminal and a base station that can implement the proposed embodiment. The terminal and the base station shown in FIG. 24 operate to implement the embodiment of the method for transmitting and receiving the acknowledgment information between the terminal and the base station described above.

A terminal (UE: User Equipment) 1 can operate as a transmission end in the uplink and as a reception end in the downlink. Also, the base station (eNB: e-Node B or gNB: new generation Node B) 100 can operate as a receiving end in the uplink and as a transmitting end in the downlink.

That is, the terminal and the base station may include transmitters 10 and 110 and receivers 20 and 120, respectively, to control transmission and reception of information, data and/or messages. , Antennas 30, 130, etc. for sending and receiving data and/or messages.

In addition, each of the terminal and the base station includes a processor 40, 140 for performing the above-described embodiment of the present invention, and a memory 50, 150 capable of temporarily or continuously storing a processing process of the processor. You can

In the terminal 1 configured as above, the receiver 20 receives N pieces (N is a natural number) of downlink data. At this time, one downlink data includes M (M is a natural number) transmission blocks (Transmission Block; TB), and one TB includes L (L is a natural number) code block group (Code Block Group; CBG). including. Then, the terminal 1 sends the acknowledgment information for the total N*M*L CBGs included in the N downlink data by the processor 40 to X (X is greater than or equal to 1) based on a certain rule. , N is a natural number smaller than N*M*L) Bundling is performed on acknowledgment information having a bit size. Then, the terminal 1 transmits the bundling X-bit size acknowledgment information to the base station 100 by the transmitter 10.

In response to this, the base station 100 causes the transmitter 110 to transmit N (N is a natural number) downlink data to the terminal 1. At this time, as described above, one downlink data includes M (M is a natural number) transmission blocks (Transmission Block; TB), and one TB includes L (L is a natural number) code block group (Code). Block Group; CBG). Then, the base station 100 uses the receiver 120 to bind the acknowledgment information for the total N*M*L CBGs included in the N pieces of downlink data from the terminal 1 to the X(X Is larger than or equal to 1 and is a natural number smaller than N*M*L).

A transmitter and a receiver included in a terminal and a base station include a packet modulation/demodulation function for data transmission, a high-speed packet channel coding function, an Orthogonal Frequency Division Multiple Access (OFDMA) packet scheduling, and a time division duplex. (TDD: Time Division Duplex) packet scheduling and/or channel multiplexing function can be provided. In addition, the terminal and the base station of FIG. 27 may further include a low power RF (Radio Frequency)/IF (Intermediate Frequency) unit.

On the other hand, in the present invention, as terminals, a personal digital assistant (PDA), a cellular phone, a personal communication service (PCS) phone, a GSM (registered trademark) (Global System for Mobile) phone, and a WCDMA (WCDMA) phone. (Registered trademark) (Wideband CDMA) phones, MBS (Mobile Broadband System) phones, handheld PCs (Hand-held PCs), notebook PCs, smart phones, or multi-mode multi-band (MM-MB: Multi Mode-Multi Band). ) A terminal or the like can be used.

Here, the smartphone is a terminal device that combines the advantages of the mobile communication terminal and the personal mobile terminal, and the mobile communication terminal has the functions of the personal mobile terminal such as schedule management, facsimile transmission/reception, and internet connection. It can mean a terminal integrated with the data communication function. In addition, the multi-mode multi-band terminal is a portable Internet system and other mobile communication systems (for example, a CDMA (Code Division Multiple Access) 2000 system, a WCDMA (Wideband CDMA) system) that include a multi-modem chip. Etc.) refers to a terminal that can operate in any of the above.

The embodiments of the present invention can be implemented by various means. For example, the embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

In the case of a hardware implementation, the method according to the embodiments of the present invention may include one or more ASICs (application specific integrated circuits), DSPs (digital signal processing probes, DSPDs). ), an FPGA (field programmable gate array), a processor, a controller, a microcontroller, a microprocessor, and the like.

In the case of being implemented by firmware or software, the method according to the embodiment of the present invention may be implemented as a module, a procedure, or a function that performs the functions or operations described above. For example, software code may be stored in memory 50, 150 and driven by processor 14, 140. The memory unit is provided inside or outside the processor and can exchange data with the processor by various means that are already known.

The present invention can be embodied as other specific forms without departing from the technical idea and essential features of the present invention. Therefore, the above detailed description should not be construed as limiting in any way, and should be considered as exemplary. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and any modification within the equivalent scope of the present invention is included in the scope of the present invention. Further, an embodiment may be configured by combining claims that are not in the explicit citation relationship in the claims, and may be included as a new claim by amendment after application.

The embodiments of the present invention can be applied to various wireless connection systems. Examples of various wireless connection systems include 3GPP (3rd Generation Partnership Project) or 3GPP2 system. The embodiments of the present invention can be applied not only to the above various wireless connection systems but also to all technical fields to which the above various wireless connection systems are applied. Furthermore, the proposed method can also be applied to mmWave communication systems that utilize the ultra-high frequency band.

-The total ACK/NACK payload size after ACK/NACK bundling is 2 bits.

As a specific example, a terminal may perform inter-TB bundling (hereinafter, gradual inter-bundling) on PDSCHs corresponding to three CCs (eg, CC index 0, CC index 1, CC index 2) and three slots. Inter-TB bundling (per CBG index) is assumed. In this case, the ACK/NACK transmission/reception method for each option described above is shown in FIGS.

In FIG. 18 to FIG. 20, the larger the CC index and the larger the slot index (within the same CC index), the faster the order of applying Inter-TB bundling (per CBG index), and the shaded area is shown. The part indicated by the symbol indicates a unit (i.e., PDSCH) in which the Inter-CBG bundling (per CBG index) is performed, and the numbers indicate the order in which the Inter-TB bundling (per CBG index) is applied.

Claims (12)

A method for a terminal to transmit acknowledgment information to a base station in a wireless communication system, comprising:
Receive N (N is a natural number) downlink data,
One downlink data includes M (M is a natural number) transmission blocks (Transmission Block; TB),
One TB includes L (L is a natural number) code block groups (Code Block Group; CBG);
Acknowledgment information for a total of N*M*L CBGs included in the N downlink data is X (X is greater than or equal to 1 and is a natural number less than N*M*L based on a certain rule. B) bundling the acknowledgment information of bit size; and transmitting the acknowledgment information of the bundled X bit size to the base station; The certain rules are
Corresponding to the first rule for bundling the acknowledgment information of all CBGs included in the same TB,
The method according to claim 1, wherein the X corresponds to N*M. The certain rules are
Corresponding to the second rule for bundling the acknowledgment information of all CBGs having the same CBG index for each TB,
The method of transmitting confirmation response information according to claim 1, wherein the X corresponds to N*L. The certain rules are
Corresponding to the third rule for bundling the acknowledgment information of all CBGs included in the TB having the same TB index for each downlink data and having the same CBG index for each TB,
The method for transmitting confirmation response information according to claim 1, wherein the X corresponds to M*L. The certain rules are
Corresponding to the fourth rule for bundling the acknowledgment information of all CBGs included in the same downlink data,
The method for transmitting confirmation response information according to claim 1, wherein the X corresponds to N. The certain rules are
The acknowledgment information of all CBGs included in the same TB is bundled into the first acknowledgment information, and the first acknowledgment information of all TBs having the same TB index for each downlink data is transmitted as the second acknowledgment information. Corresponding to the fifth rule for bundling acknowledgment information,
The method according to claim 1, wherein the X corresponds to M. The certain rules are
Corresponding to the sixth rule for bundling the acknowledgment information of all CBGs having the same CBG index for all TBs included in the N downlink data,
The method of transmitting confirmation response information according to claim 1, wherein the X corresponds to L. The certain rules are
Corresponding to the seventh rule for bundling the acknowledgment information for the N*M*L CBGs,
The method for transmitting confirmation response information according to claim 1, wherein the X corresponds to 1. The certain rules are
When the acknowledgment information for the N*M*L CBGs is bundled stepwise, and the size of the acknowledgment information bundled up to Y (Y is a natural number) is less than a specific bit size. The method according to claim 1, which corresponds to the eighth rule for stopping the bundling. A method for a base station to receive acknowledgment information from a terminal in a wireless communication system, comprising:
Transmitting N (N is a natural number) downlink data to the terminal,
One downlink data includes M (M is a natural number) transmission blocks (Transmission Block; TB),
One TB includes L (L is a natural number) code block groups (Code Block Group; CBG); and for a total of N*M*L CBGs included in the N downlink data from the terminal. Receiving acknowledgment information of size X (where X is greater than or equal to 1 and a natural number less than N*M*L), the acknowledgment information being bundled according to a certain rule; How to receive acknowledgment information. A terminal for transmitting confirmation information to a base station in a wireless communication system,
Receiver;
A transmitter; and a processor connected to the receiver and the transmitter to operate,
The processor is configured to receive N (N is a natural number) downlink data,
One downlink data includes M (M is a natural number) transmission blocks (Transmission Block; TB),
One TB includes L (L is a natural number) code block groups (Code Block Group; CBG),
The processor transmits acknowledgment information for a total of N*M*L CBGs included in the N downlink data to X (X is greater than or equal to 1 and N*M*L based on a certain rule). A smaller natural number) configured to perform bundling on acknowledgment information having a bit size,
The terminal, wherein the processor is configured to send the bundled X-bit sized acknowledgment information to the base station. A base station for receiving acknowledgment information from a terminal in a wireless communication system,
Receiver;
A transmitter; and a processor connected to the receiver and the transmitter to operate,
The processor is configured to transmit N (N is a natural number) downlink data to the terminal,
One downlink data includes M (M is a natural number) transmission blocks (Transmission Block; TB),
One TB includes L (L is a natural number) code block groups (Code Block Group; CBG),
The processor may perform X (where X is larger than 1 or X) in which the acknowledgment information for the total N*M*L CBGs included in the N downlink data from the terminal is bundled based on a certain rule. A base station configured to receive acknowledgment information of equal size and a natural number less than N*M*L.